A new approach to recruitment overfishing diagnosis based on fish condition from survey data
A new approach to recruitment overfishing diagnosis is presented. We hypothesize that condition of recruits should increase when recruitment failures are caused by fishing activity. This would be a consequence of the increase in trophic resource availability, because the population is smaller than t...
| Main Authors: | , , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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Consejo Superior de Investigaciones Científicas
2019-12-01
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| Series: | Scientia Marina |
| Subjects: | |
| Online Access: | http://scientiamarina.revistas.csic.es/index.php/scientiamarina/article/view/1819 |
| _version_ | 1818675548334850048 |
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| author | Francesc Ordines Josep Lloret Pilar Tugores Chiara Manfredi Beatriz Guijarro Angélique Jadaud Cristina Porcu Luis Gil de Sola Roberto Carlucci Marina Sartini Igor Isajlović Enric Massutí |
| author_facet | Francesc Ordines Josep Lloret Pilar Tugores Chiara Manfredi Beatriz Guijarro Angélique Jadaud Cristina Porcu Luis Gil de Sola Roberto Carlucci Marina Sartini Igor Isajlović Enric Massutí |
| author_sort | Francesc Ordines |
| collection | DOAJ |
| description | A new approach to recruitment overfishing diagnosis is presented. We hypothesize that condition of recruits should increase when recruitment failures are caused by fishing activity. This would be a consequence of the increase in trophic resource availability, because the population is smaller than that which the ecosystem could support. Temporal series of hake recruit condition were calculated from MEDITS survey data collected in Mediterranean geographical sub-areas (GSAs) 1, 6, 17 and 19 from 1994 to 2015. Multiple linear regressions were used to analyse the relationship between mean annual condition and abundance of recruits and climatic indices in each GSA. Significant correlations were only detected in GSA 6, where 69% of condition variability was explained by the negative correlation with recruit abundance, and with two climatic indices, the Western Mediterranean Oscillation and the standardized air temperature anomaly at surface from the Gulf of Lions. Despite the differences in recruit abundance among GSAs, their mean annual condition oscillated around the same basal value during most of the time series, pointing to density-dependent mortality rates as an important mechanism stabilizing hake recruitment to levels close to the carrying capacity when populations do not suffer recruitment overfishing. This pattern changed when the decreasing recruit abundance trend drove GSA 6 condition values persistently above those of the rest of the GSAs. According to our hypothesis, hake in GSA 6 is in recruitment overfishing. |
| first_indexed | 2024-12-17T08:29:20Z |
| format | Article |
| id | doaj.art-5bea7f2b80a0447e91f77762eeb2b521 |
| institution | Directory Open Access Journal |
| issn | 0214-8358 1886-8134 |
| language | English |
| last_indexed | 2024-12-17T08:29:20Z |
| publishDate | 2019-12-01 |
| publisher | Consejo Superior de Investigaciones Científicas |
| record_format | Article |
| series | Scientia Marina |
| spelling | doaj.art-5bea7f2b80a0447e91f77762eeb2b5212022-12-21T21:56:39ZengConsejo Superior de Investigaciones CientíficasScientia Marina0214-83581886-81342019-12-0183S122323310.3989/scimar.04950.03A1783A new approach to recruitment overfishing diagnosis based on fish condition from survey dataFrancesc Ordines0https://orcid.org/0000-0002-2456-2214Josep Lloret1https://orcid.org/0000-0002-3917-1152Pilar Tugores2https://orcid.org/0000-0003-2923-3038Chiara Manfredi3https://orcid.org/0000-0002-2852-4856Beatriz Guijarro4https://orcid.org/0000-0002-2083-4681Angélique Jadaud5https://orcid.org/0000-0001-6858-3570Cristina Porcu6https://orcid.org/0000-0003-2649-6502Luis Gil de Sola7https://orcid.org/0000-0003-1987-9716Roberto Carlucci8https://orcid.org/0000-0002-9287-6936Marina Sartini9https://orcid.org/0000-0003-1545-2109Igor Isajlović10https://orcid.org/0000-0001-7101-9575Enric Massutí11https://orcid.org/0000-0002-9524-5873Instituto Español de Oceanografía, Centre Oceanogràfic de les BalearsUniversitat de GironaInstituto Español de Oceanografía, Centre Oceanogràfic de les BalearsUniversità di BolognaInstituto Español de Oceanografía, Centre Oceanogràfic de les BalearsIFREMER, Laboratoire Halieutique MediterranéeDepartment of Life and Environmental Sciences, University of CagliariInstituto Español de Oceanografía, Centro Oceanográfico de MálagaUniversità degli studi di Bari Aldo MoroAplysia Soc. Coop. r.l.Institute of Oceanography and FisheriesInstituto Español de Oceanografía, Centre Oceanogràfic de les BalearsA new approach to recruitment overfishing diagnosis is presented. We hypothesize that condition of recruits should increase when recruitment failures are caused by fishing activity. This would be a consequence of the increase in trophic resource availability, because the population is smaller than that which the ecosystem could support. Temporal series of hake recruit condition were calculated from MEDITS survey data collected in Mediterranean geographical sub-areas (GSAs) 1, 6, 17 and 19 from 1994 to 2015. Multiple linear regressions were used to analyse the relationship between mean annual condition and abundance of recruits and climatic indices in each GSA. Significant correlations were only detected in GSA 6, where 69% of condition variability was explained by the negative correlation with recruit abundance, and with two climatic indices, the Western Mediterranean Oscillation and the standardized air temperature anomaly at surface from the Gulf of Lions. Despite the differences in recruit abundance among GSAs, their mean annual condition oscillated around the same basal value during most of the time series, pointing to density-dependent mortality rates as an important mechanism stabilizing hake recruitment to levels close to the carrying capacity when populations do not suffer recruitment overfishing. This pattern changed when the decreasing recruit abundance trend drove GSA 6 condition values persistently above those of the rest of the GSAs. According to our hypothesis, hake in GSA 6 is in recruitment overfishing.http://scientiamarina.revistas.csic.es/index.php/scientiamarina/article/view/1819merluccius merlucciusfisheryrecruitscondition indexrecruitment overfishingmedits survey |
| spellingShingle | Francesc Ordines Josep Lloret Pilar Tugores Chiara Manfredi Beatriz Guijarro Angélique Jadaud Cristina Porcu Luis Gil de Sola Roberto Carlucci Marina Sartini Igor Isajlović Enric Massutí A new approach to recruitment overfishing diagnosis based on fish condition from survey data Scientia Marina merluccius merluccius fishery recruits condition index recruitment overfishing medits survey |
| title | A new approach to recruitment overfishing diagnosis based on fish condition from survey data |
| title_full | A new approach to recruitment overfishing diagnosis based on fish condition from survey data |
| title_fullStr | A new approach to recruitment overfishing diagnosis based on fish condition from survey data |
| title_full_unstemmed | A new approach to recruitment overfishing diagnosis based on fish condition from survey data |
| title_short | A new approach to recruitment overfishing diagnosis based on fish condition from survey data |
| title_sort | new approach to recruitment overfishing diagnosis based on fish condition from survey data |
| topic | merluccius merluccius fishery recruits condition index recruitment overfishing medits survey |
| url | http://scientiamarina.revistas.csic.es/index.php/scientiamarina/article/view/1819 |
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